Pedals that stack with the GFI System Jonassus Overdrive

Shin's Music Dumbloid

Shin's Music Dumbloid takes that high gain character and pushes it toward tight

Xotic EP Booster

Feed a high gain signal into Xotic EP Booster and it comes out closer to clean boost

Electro-Harmonix Electric Mistress

Put Electro-Harmonix Electric Mistress after GFI System Jonassus Overdrive in the signal chain, clear of GFI System Jonassus Overdrive's own gain stage

Warm Audio Pedal 76 Compressor

Warm Audio Pedal 76 Compressor's own tight character is the real reason this is worth trying

Cusack Music Delay TME

Put Cusack Music Delay TME after GFI System Jonassus Overdrive in the signal chain, clear of GFI System Jonassus Overdrive's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

TC Electronic Triple Flashback Delay

Keep TC Electronic Triple Flashback Delay after GFI System Jonassus Overdrive in the signal chain, clear of GFI System Jonassus Overdrive's own gain stage — goes in the amp's FX loop (or last, into a clean amp)